Toby Corkindale <[email protected]> writes:
> I ran a quick test using (non-zfs) equivalents of various compression
> tools, over a 2.0G filesystem image. (ie. hoping that represents a
> fair variety of binary+text files)
>
> xz 253s 103M
That is substantially better compression ratio than what I see when
compressing root filesystems, e.g.
Exportable Squashfs 4.0 filesystem, xz compressed, data block size 1MiB
[debian wheezy minimal]
Filesystem size 50114.51 Kbytes (48.94 Mbytes)
22.45% of uncompressed filesystem size (223224.17 Kbytes)
[debian jessie grumpy sysadmin desktop]
Filesystem size 436156.57 Kbytes (425.93 Mbytes)
27.39% of uncompressed filesystem size (1592218.93 Kbytes)
[debian wheezy XFCE luser desktop]
Filesystem size 1009350.84 Kbytes (985.69 Mbytes)
37.00% of uncompressed filesystem size (2727952.22 Kbytes)
Were you compressing a .cpio, .tar or what? Or was it simply a 2GiB ext
filesystem that contained (maybe a lot) less than 2GiB of actual data?
BTW there is "pxz" and "pixz" which can use >1 core;
xz from xz-utils is still single-threaded.
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